The aromatic plants used in this study are the same as the onesused by Chalkos et al. (2010) in the form of composts, i.e. spearmintand sage. The two species differ in both their habit and essentialoil. Spearmint is a herbaceous perennial species, whereas sage is ashrub. They both grow abundantly in the wild and are also culti-vated in Greece. Spearmint, in particular, is the commonest mintspecies in the country forming large populations at an altitudebetween sea level and 1500 m (occasionally up to 2000 m)